SAMPLE QUESTION PAPER (2021-22)
BIOLOGY (044)
TERM II
CLASS 12
Time: 2 Hrs Max. Marks: 40
GENERAL INSTRUCTIONS
i. All questions are compulsory.
ii. The question paper has three sections and 13 questions. All questions are compulsory.
iii. Mark distribution:
a. Section–A has 6 questions of 2 marks each
b. Section–B has 6 questions of 3 marks each
c. Section–C has a case-based question of 5 marks.
iv. There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
v. Wherever necessary, neat and properly labelled diagrams should be drawn.
SECTION A
Attempt all questions: –
Q.1 How are the members of the genus glomus useful to organic farmers?
Q.2. Mention the four steps involved in the isolation of DNA from a bacterial cell for biotechnology experiments.
OR
Mention the two objectives of setting up the organization GEAC by the Indian Govt
Q.3. List the four causes (Evil Quartets) responsible for loss of biodiversity.
Q.4. Name two viral diseases that are transmitted by mosquito vectors? Name the causal organism of typhoid.
OR
a) Write the causative organism of a amoebiasis.
b) Mention any three characteristics symptoms of the disease.
Q.5. a) Mention the cause of ADA deficiency and its effect on the human body
b) What can be a possible permanent cause?
Q.6. Define Gause competitive release? Give an example where an animal-plant interaction involves coevolution.
SECTION B
Q.7. a) What is insertional inactivation?
b) State the roles o: (1) Ori and (2) Ropgene in E. Coli Cloning Vector pBR3222
Q.8. Differentiate between a Normal cell and Cancerous cell?
Q. 9. Explain life cycle of Malarial parasite. Name its infective stage also?
OR
a) Define Allergy.
b) Name the cells and the chemical responsible for causing allergic reaction in our body.
c) Mention any four symptoms of allergy.
Q.10 What is RNAi? Mention the role of Agrobacterium in the production of Nematode- resistant tobacco plant?
Q.11 Give three reasons that account for greater biological diversity in the tropics than in the temperate regions.
Q.12 Write the function of (i) statin (ii) Cyclosporine-A
Also write the source from where they are obtained.
SECTION C
Q.13 Observe the outline/structure of a drug given below and answer the following questions:
a) Name of the group of drugs, it represents and write the scientific name of its source plant.
b) Write the four forms in which these are consumed.
c) Mention the methods in which they are taken.
d) Name of the organ system of the body, which it’s affected.
OR
a) Name the type of growth above ‘a’ and mention when this type of growth curve occurs in the nature.
b) Why is the growth curve ‘b’ said to be logistic?
c) Differentiate between the two growth curves ‘a’ and ‘b’.